chop and chomp in Java

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chop and chomp
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The command chop cuts off the last character of a string. This is useful for removing newline characters when reading files, etc. The syntax is chop; # chop $_;
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chop scalar; # remove last character in $scalar
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A slightly more refined version which only chops off whitespace and end of line characters is the chomp function.
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Perl subroutines
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Subroutines are indicated, as in the example above, by the ampersand & symbol. When parameters are passed to a Perl subroutine, they are handed over as an array called @__, which is analogous to the $_ variable. Here is a simple example: #!/local/b in/perl $a="silver"; $b="gold"; SPrintArgs ($a, $b) ; # end of main sub PrintArgs
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{ ($local_a,$local_b) = @_;
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print "$local_a, $local_b\n";
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When a program has to quit and give a message, the die command is normally used. If called without an argument, Perl generates its own message including a line number at which the error occurred. To include your own message, you write die "My message . . . . " ; If the string is terminated with a \n newline character, the line number of the error is not printed, otherwise Perl appends the line number to your string. When opening files, it is common to see the syntax: open (filehandle, "Filename" ) || die "Can't open. .."; The logical OR symbol is used, because open returns true if all goes well, in which case the right-hand side is never evaluated. If open is false, then die is executed. You can decide for yourself whether or not you think this is good programming style we mention it here because it is common practice. The stat ( ) idiom The Unix library function stat ( ) is used to find out information about a given file. This function is available both in C and in Perl. In Perl, it returns an array of values. Usually, we are interested in knowing the access permissions of a file, stat ( ) is called using the syntax @array=stat ("filename");
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Appendix C: Programming and Compiling
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or alternatively, using a named array (device,$inode,$mode) = stat("file name" ) ; The value returned in the mode variable is a bit-pattern. The most useful way of treating these bit patterns is to use octal numbers to interpret their meaning. To find out whether a file is readable or writable to a group of users, we use a programming idiom which is very common for dealing with bit patterns: first we define a mask which zeroes out all of the bits in the mode string except those which we are specifically interested in. This is done by defining a mask value in which the bits we want are set to 1 and all others are set to zero. Then we AND the mask with the mode string. If the result is different from zero then we know that all of the bits were also set in the mode string. As in C, the bitwise AND operator in Perl is called &. For example, to test whether a file is writable to other users in the same group as the file, we would write the following: $mask = 020; # Leading 0 means octal number ($device,$inode,$mode) =stat("file"); if ($mode $mask) { print "File is writable by the group" ; > Here the 2 in the second octal number means 'write', the fact that it is the second octal number from the right means that it refers to 'group'. Thus, the result of the if-test is only true if that particular bit is true. We shall see this idiom in action below. Perl Example Programs
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Here is a simple implementation of the Unix passwd program in Perl. #!/local/bin/perl # # A per 1 version of the passwd program. # # Note - the real passwd program needs to be much more # secure than this one. This is just to demonstrate the # use of the crypt() function. # ########################################################## print "Changing passwd for $ENV{ 'USER' > on $ENV{ 'HOST'}\n" ; system ' stty','-echo'; print "Old passwd: "; $oldpwd = <STDIN>; chop $oldpwd; ($name,$coded_jpwd,$uid,$gid,$x,$y,$z,$gcos,$home,$she11) =getpwnam($ENV"USER" ;
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